Riser for metal molds



May 22, 192s. y

J. L. DOSTAL RISER FOR METAL MOLDS Filed May 29, 1926 INVENTOR.

ffy. a

ATTORNEY.

Patented May 22, 1928.

. UNITED STATES PATENT OFFICE.I

`.IosIunI L'. DosTAII., or DETROIT, MICHIGAN, iIssIefNoIv To EARLv HOLLEY, 0F DETROIT, MIcHIeAN.

' nIsER FOR METAL MOL'DS.

The object of this invention is first to reduce the sprue loss when pouring metals into metal molds. Secondly, to give an indication to the man pouring a mold when he should cease to pour. Thirdly, to assist in washing out the;l cold shots which tend to float to the upper part of the casting.

Figure -1 shows a mold inelevation.

Figure 2 shows 'a cross sectional elevation on the plane 2--2 of fFigure 1.

Inthe figures, A isf the sprue passage having anpouring mouth B. C\is the riser opening into a cup D, in which the rising metal in C is easily visible. E is the end to the sprue passage A, and F is the lateral gate leading therefrom feeding into the matrix G of the mold.' This mold G is surrounded by a ring Hf, corresponding to the Phillips Patent #1,099,997, dated June 16th, 1914, which bead` may in its turn be provided with a groove J, as shown vin m Patent #1,582,-

' matrix G of the mold,at`ter the molder has 169,' dated' April 27th, 19 6.

Operations-Then the mold is poured. the molder filling the mold pours the' iron into the mouth B of' the sprue A and Watches the cup `I) connected to the riser C. The moment heobserves iron. entering C .he ceasesI to pour. The level of the iron then in the 'sprue A and mouth B will stand momentari` ly at level corresponding to the broken lines in C and E. Immediately the ironseeksv its proper level. A small volume of iron is therefore caused to flow through F into the ceased to pour. This quantity of iron is more or less constant, and it .thus happens that a relatively constant quantity of iron passes into the matrix of the `Imold, and'of l Application led May 29, 1926. Serial No. 112,418.

course a like quantity must at the same time pass out through the 'riser'C at-the terminationof each pouring period.

, Not only is this an advantage in that coni ditions are rendered more uniform,`or rather it i-s made possible to make conditions uniform, but, -what is of more importance, a cold shot that might be formedbeneath the riser C is carried off into C and a perfect .casting thereby made.

of cold shots which would otherwise form' belowv C and spoil the castingl What I claim is In combination with a metal mold having aY matrix with .an extensive surface and arestrlcted volufrrfie, a pouring mouth, a sprue n,

having a vollijie comparable to that .of the ,matrix, agate leading therefrom and disfharging into said matrix.- a riser, a relatively large cup into whichthe riser discharges at a level suiciently far below the level of 'the entrance from the pouring mouth into the sprue that when-the pouring operation ceases, iron will automatically flow down the sprueand up into the riser cup, thereby displacing a considerable percentage of Ithe iron from thel matrix into the riser.

In testimony whereof I affix my signature. 

